/* ==========================================================================
   محمد علاء / Mohamed Alaa — Portfolio & Software Hub Design System
   Modern CSS: Logical Properties, CSS Variables, Clamp, Glassmorphism, 60fps animations
   WCAG 2.2 AA Accessible & Responsive (320px -> 4K)
   ========================================================================== */

/* -----------------------------
   Design Tokens & Themes
   ----------------------------- */
:root {
  /* Brand Color Palette */
  --primary-hue: 224;
  --primary: hsl(var(--primary-hue), 90%, 58%);
  --primary-hover: hsl(var(--primary-hue), 90%, 65%);
  --primary-glow: hsla(var(--primary-hue), 90%, 58%, 0.35);
  
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
  --grad-cyan-blue: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --grad-card-glow: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(99, 102, 241, 0.15), transparent 40%);

  /* Typography */
  --font-ar: "Tajawal", "Cairo", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family: var(--font-ar);

  /* Elevation & Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 32px var(--primary-glow);

  /* Transitions */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --trans-fast: 0.15s ease;
  --trans-normal: 0.25s var(--ease-spring);
  --trans-smooth: 0.4s var(--ease-spring);

  /* Spacing & Layout */
  --container-max: 1240px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

/* Dark Theme (Default) */
[data-theme="dark"], :root:not([data-theme="light"]) {
  --bg-body: #070a12;
  --bg-surface: #0e1526;
  --bg-surface-elevated: #151f38;
  --bg-surface-glass: rgba(14, 21, 38, 0.75);
  --bg-input: #0a0f1d;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(99, 102, 241, 0.16);
  --border-focus: #60a5fa;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --text-inverse: #0f172a;

  --badge-bg: rgba(59, 130, 246, 0.15);
  --badge-text: #93c5fd;

  --nav-backdrop: rgba(7, 10, 18, 0.85);
  --card-spotlight: rgba(99, 102, 241, 0.12);
}

/* Light Theme */
[data-theme="light"] {
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --bg-input: #ffffff;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-card: rgba(99, 102, 241, 0.2);
  --border-focus: #2563eb;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --text-inverse: #ffffff;

  --badge-bg: rgba(59, 130, 246, 0.1);
  --badge-text: #1d4ed8;

  --nav-backdrop: rgba(255, 255, 255, 0.9);
  --card-spotlight: rgba(59, 130, 246, 0.08);
}

/* -----------------------------
   CSS Reset & Base Setup
   ----------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

html[lang="en"] {
  --font-family: var(--font-en);
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--trans-smooth), color var(--trans-smooth);
}

/* Ambient Background Mesh */
body::before {
  content: "";
  position: fixed;
  inset-block-start: -20vh;
  inset-inline-start: -20vw;
  inline-size: 140vw;
  block-size: 140vh;
  background: 
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.08), transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(139, 92, 246, 0.07), transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.05), transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Accessible focus styles */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip link for WCAG */
.skip-link {
  position: absolute;
  inset-block-start: -100px;
  inset-inline-start: 1rem;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: inset-block-start 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  inset-block-start: 1rem;
}

/* Links & Images */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--trans-fast);
}

img, picture, svg {
  display: block;
  max-inline-size: 100%;
  height: auto;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
}

button {
  cursor: pointer;
}

/* Containers */
.container {
  inline-size: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

/* -----------------------------
   Scroll Progress Bar
   ----------------------------- */
#scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline-start: 0;
  block-size: 3px;
  inline-size: 0%;
  background: var(--grad-primary);
  z-index: 1000;
  transition: inline-size 0.08s linear;
}

/* -----------------------------
   Header & Navigation
   ----------------------------- */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 900;
  block-size: var(--header-height);
  display: flex;
  align-items: center;
  transition: background-color var(--trans-normal), backdrop-filter var(--trans-normal), border-color var(--trans-normal), block-size var(--trans-normal);
  border-block-end: 1px solid transparent;
}

.site-header.scrolled {
  background-color: var(--nav-backdrop);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-block-end-color: var(--border-subtle);
  block-size: calc(var(--header-height) - 10px);
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  inline-size: 100%;
}

/* Brand Logo */
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  letter-spacing: -0.02em;
}

.brand-logo-icon {
  inline-size: 38px;
  block-size: 38px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  background: var(--grad-primary);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 4px 14px var(--primary-glow);
  flex-shrink: 0;
}

.brand-text-accent {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Desktop Navigation Menu */
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-item-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  padding-block: 0.5rem;
  transition: color var(--trans-fast);
}

.nav-item-link:hover,
.nav-item-link.active {
  color: var(--text-main);
}

.nav-item-link::after {
  content: "";
  position: absolute;
  inset-block-end: 0;
  inset-inline: 0;
  block-size: 2px;
  background: var(--grad-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--trans-normal);
  border-radius: var(--radius-full);
}

.nav-item-link:hover::after,
.nav-item-link.active::after {
  transform: scaleX(1);
}

/* Nav Actions (Theme, Language, Menu Toggle) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  inline-size: 40px;
  block-size: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-glass);
  color: var(--text-main);
  display: grid;
  place-items: center;
  transition: background-color var(--trans-fast), border-color var(--trans-fast), transform var(--trans-fast);
}

.icon-btn:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.lang-switch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding-inline: 0.85rem;
  block-size: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-glass);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  transition: border-color var(--trans-fast), background var(--trans-fast), transform var(--trans-fast);
}

.lang-switch-btn:hover {
  border-color: var(--primary);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
}

/* -----------------------------
   Mobile Drawer Navigation
   ----------------------------- */
.mobile-drawer {
  position: fixed;
  inset-block-start: 0;
  inset-inline-end: 0;
  inline-size: min(80vw, 320px);
  block-size: 100vh;
  background: var(--bg-surface);
  border-inline-start: 1px solid var(--border-subtle);
  z-index: 950;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  transform: translateX(100%);
  transition: transform var(--trans-smooth);
  box-shadow: var(--shadow-lg);
}

html[dir="rtl"] .mobile-drawer {
  transform: translateX(-100%);
}

.mobile-drawer.open {
  transform: translateX(0);
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 940;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--trans-normal);
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.drawer-link {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-muted);
  display: block;
  padding-block: 0.4rem;
}

.drawer-link:hover, .drawer-link.active {
  color: var(--primary);
}

/* -----------------------------
   Hero Section
   ----------------------------- */
.hero-section {
  position: relative;
  padding-block: clamp(3.5rem, 9vh, 7rem) clamp(2.5rem, 6vh, 4.5rem);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid rgba(59, 130, 246, 0.25);
  margin-block-end: 1.5rem;
}

.hero-badge-pulse {
  inline-size: 8px;
  block-size: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-block-end: 1rem;
}

.hero-typed-wrapper {
  display: block;
  min-block-size: 1.3em;
  margin-block-start: 0.5rem;
  color: var(--text-muted);
  font-size: clamp(1.25rem, 2.5vw, 1.85rem);
  font-weight: 700;
}

.typed-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.typed-cursor {
  display: inline-block;
  inline-size: 3px;
  margin-inline-start: 4px;
  background-color: var(--primary);
  animation: blink 0.9s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-lead {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  color: var(--text-muted);
  max-inline-size: 640px;
  margin-block-end: 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-block-end: 2.5rem;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.98rem;
  transition: all var(--trans-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--primary-glow);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px var(--primary-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-surface-glass);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

/* Quick Hero Highlights */
.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--border-subtle);
}

.hero-highlight-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-highlight-icon {
  color: var(--accent-emerald);
}

/* -----------------------------
   Stats Section
   ----------------------------- */
.stats-section {
  padding-block: 2.5rem;
  background: var(--bg-surface);
  border-block: 1px solid var(--border-subtle);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--trans-normal), border-color var(--trans-normal);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-card);
}

.stat-icon {
  inline-size: 52px;
  block-size: 52px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  background: var(--badge-bg);
  color: var(--primary);
  flex-shrink: 0;
}

.stat-num {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 0.15rem;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* -----------------------------
   Section Headers
   ----------------------------- */
.section {
  padding-block: clamp(4rem, 8vh, 6.5rem);
}

.section-header {
  text-align: center;
  max-inline-size: 680px;
  margin-inline: auto;
  margin-block-end: clamp(2.5rem, 5vh, 4rem);
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-block-end: 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.25;
  margin-block-end: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* -----------------------------
   Portfolio Toolbar (Search & Filter)
   ----------------------------- */
.portfolio-toolbar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-block-end: 2.5rem;
  background: var(--bg-surface);
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

@media (min-width: 768px) {
  .portfolio-toolbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.search-box-wrap {
  position: relative;
  flex: 1;
  max-inline-size: 420px;
}

.search-input {
  inline-size: 100%;
  padding-block: 0.75rem;
  padding-inline-start: 2.75rem;
  padding-inline-end: 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  transition: border-color var(--trans-fast);
}

.search-input:focus {
  border-color: var(--primary);
}

.search-icon {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 1rem;
  transform: translateY(-50%);
  color: var(--text-subtle);
  pointer-events: none;
}

.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.5rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  transition: all var(--trans-fast);
}

.filter-btn:hover {
  color: var(--text-main);
  border-color: var(--primary);
}

.filter-btn.active {
  background: var(--grad-primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 14px var(--primary-glow);
}

/* -----------------------------
   Projects & Games Grid
   ----------------------------- */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

/* App Card Component */
.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--trans-smooth), border-color var(--trans-smooth), box-shadow var(--trans-smooth);
  transform-style: preserve-3d;
  will-change: transform;
}

/* Mouse spotlight glow layer */
.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--card-spotlight);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-card);
  box-shadow: var(--shadow-lg);
}

.project-card:hover::before {
  opacity: 1;
}

.card-media-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-surface-elevated);
  overflow: hidden;
}

.card-img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .card-img {
  transform: scale(1.04);
}

.card-badge-top {
  position: absolute;
  inset-block-start: 0.85rem;
  inset-inline-start: 0.85rem;
  background: rgba(14, 21, 38, 0.85);
  backdrop-filter: blur(8px);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-block-end: 0.75rem;
}

.card-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
}

.card-title a:hover {
  color: var(--primary);
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-block-end: 1.25rem;
  flex: 1;
}

.card-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-block-end: 1.25rem;
  padding-block: 0.75rem;
  border-block: 1px dashed var(--border-subtle);
}

.card-feature-item {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-feature-bullet {
  color: var(--accent-emerald);
  font-weight: bold;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-block-end: 1.5rem;
}

.tag-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  color: var(--text-subtle);
  border: 1px solid var(--border-subtle);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-block-start: auto;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--border-subtle);
}

.card-platform-info {
  display: flex;
  flex-direction: column;
}

.card-platform-text {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
}

.card-size-text {
  font-size: 0.72rem;
  color: var(--text-subtle);
}

/* Educational Games Predictive Cards */
.game-card {
  position: relative;
  overflow: hidden;
  border: 1px dashed var(--border-card);
}

.game-visual-placeholder {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  position: relative;
  color: #fff;
}

.game-visual-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.2;
  background-image: radial-gradient(#fff 1px, transparent 1px);
  background-size: 16px 16px;
}

.game-icon-large {
  font-size: 3.5rem;
  filter: drop-shadow(0 8px 16px rgba(0,0,0,0.3));
}

.badge-coming-soon {
  background: var(--grad-primary);
  color: #fff;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* -----------------------------
   About Section
   ----------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.about-text-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-text-content p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-ai-badge {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  margin-block-start: 1rem;
}

.about-ai-badge-icon {
  font-size: 1.8rem;
  color: var(--primary);
  flex-shrink: 0;
}

.about-skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
}

.skill-pill {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-main);
  transition: transform var(--trans-fast), border-color var(--trans-fast);
}

.skill-pill:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

/* Responsive Video Container */
.video-responsive-box {
  position: relative;
  inline-size: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #020617;
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-lg);
}

.video-responsive-box iframe {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
  border: 0;
}

/* -----------------------------
   Contact Section
   ----------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1.3fr;
  }
}

.contact-info-wrap {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-channel-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--trans-fast), transform var(--trans-fast);
}

.contact-channel-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.channel-icon {
  inline-size: 48px;
  block-size: 48px;
  border-radius: var(--radius-md);
  background: var(--badge-bg);
  color: var(--primary);
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.channel-title {
  font-size: 0.85rem;
  color: var(--text-subtle);
  font-weight: 600;
}

.channel-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Contact Form */
.contact-form {
  background: var(--bg-surface);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-input, .form-textarea {
  inline-size: 100%;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  transition: border-color var(--trans-fast);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
}

.form-textarea {
  min-block-size: 140px;
  resize: vertical;
}

/* -----------------------------
   Footer
   ----------------------------- */
.site-footer {
  background: var(--bg-surface);
  border-block-start: 1px solid var(--border-subtle);
  padding-block: 4rem 2rem;
  margin-block-start: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-block-end: 3rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color var(--trans-fast);
}

.footer-link:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding-block-start: 2rem;
  border-block-start: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-subtle);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-weight: 600;
  transition: all var(--trans-fast);
}

.back-to-top-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* -----------------------------
   Scroll Reveal Animations
   ----------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-spring), transform 0.6s var(--ease-spring);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* -----------------------------
   Responsive Breakpoints
   ----------------------------- */
@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }

  .mobile-nav-toggle {
    display: grid;
    place-items: center;
  }
}

/* -----------------------------
   App Detail Page Styles
   ----------------------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-block: 1.5rem 0.5rem;
}

.breadcrumbs a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  opacity: 0.5;
}

.app-detail-hero {
  padding-block: 2rem 3rem;
  border-block-end: 1px solid var(--border-subtle);
  margin-block-end: 3rem;
}

.app-hero-header {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.app-hero-icon {
  inline-size: 80px;
  block-size: 80px;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: grid;
  place-items: center;
  font-size: 2.8rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.app-hero-info {
  flex: 1;
  min-inline-size: 260px;
}

.app-meta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-block-end: 0.75rem;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.meta-pill.pill-primary {
  background: var(--badge-bg);
  color: var(--badge-text);
  border-color: rgba(59, 130, 246, 0.3);
}

.meta-pill.pill-verified {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.25);
}

.app-hero-title {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 900;
  line-height: 1.2;
  margin-block-end: 0.75rem;
}

.app-hero-short {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-inline-size: 780px;
  line-height: 1.7;
}

/* App Main Layout Grid */
.app-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 992px) {
  .app-detail-grid {
    grid-template-columns: 1fr 360px;
  }
}

.app-main-col {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.app-sidebar-col {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Interactive Gallery & Lightbox */
.gallery-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.gallery-main-view {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #020617;
  display: grid;
  place-items: center;
  cursor: zoom-in;
}

.gallery-main-img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.gallery-zoom-hint {
  position: absolute;
  inset-block-end: 1rem;
  inset-inline-end: 1rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  color: #fff;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  pointer-events: none;
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(12px);
  display: none;
  place-items: center;
  padding: 2rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox-modal.active {
  display: grid;
  opacity: 1;
}

.lightbox-content-wrap {
  position: relative;
  max-inline-size: 92vw;
  max-block-size: 90vh;
}

.lightbox-img {
  max-inline-size: 100%;
  max-block-size: 88vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.8);
}

.lightbox-close-btn {
  position: absolute;
  inset-block-start: -1rem;
  inset-inline-end: -1rem;
  inline-size: 44px;
  block-size: 44px;
  border-radius: 50%;
  background: rgba(30, 41, 59, 0.9);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.lightbox-close-btn:hover {
  transform: scale(1.1);
  background: #ef4444;
}

/* Detail Section Block */
.detail-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.25rem);
}

.detail-block-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-block-end: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.detail-block-body p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-block-end: 1rem;
}

.features-checklist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.feature-check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.98rem;
  color: var(--text-main);
  padding: 0.75rem 1rem;
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.feature-check-icon {
  color: var(--accent-emerald);
  font-weight: bold;
  font-size: 1.15rem;
  line-height: 1;
}

/* Requirements & Specs Table */
.specs-table {
  inline-size: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.specs-table tr {
  border-block-end: 1px solid var(--border-subtle);
}

.specs-table tr:last-child {
  border-block-end: none;
}

.specs-table th {
  text-align: start;
  padding: 0.85rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  inline-size: 35%;
  background: var(--bg-surface-elevated);
}

.specs-table td {
  padding: 0.85rem 1rem;
  color: var(--text-main);
  font-weight: 500;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--trans-fast);
}

.faq-item[open] {
  border-color: var(--border-card);
}

.faq-question {
  padding: 1.15rem 1.25rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "▾";
  font-size: 1.25rem;
  transition: transform 0.25s ease;
  color: var(--primary);
}

.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* Sidebar Download & Security Cards */
.sidebar-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.sidebar-download-btn {
  inline-size: 100%;
  padding: 1rem 1.5rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.sha-box {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-family: monospace;
  font-size: 0.78rem;
  word-break: break-all;
  color: var(--text-subtle);
  position: relative;
}

.sha-copy-btn {
  margin-block-start: 0.5rem;
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.security-badge-box {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: #10b981;
}

.security-badge-text {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.security-badge-text strong {
  color: var(--text-main);
  display: block;
  margin-block-end: 0.2rem;
}